La familia de mi novio es grande.
Su padre es médico y es un gran hombre.
Es un profesor muy bueno y un buen padre.
In Spanish, adjectives must agree in gender and number with the noun they modify.
- "Grande" agrees with "familia" (singular, feminine) in the first sentence.
- "Gran" agrees with "hombre" (singular, masculine) in the second sentence. "Gran" is used instead of "grande" before masculine singular nouns starting with a stressed "a" sound.
- "Bueno" agrees with "profesor" (singular, masculine) in the third sentence.
- "Buen" agrees with "padre" (singular, masculine) in the third sentence. "Buen" is used instead of "bueno" before masculine singular nouns starting with a stressed "o" sound.